class AddToxinAndHarmfulEffectForeignKeys < ActiveRecord::Migration
  def self.up
    add_column :data_objects, :toxin_id, :integer
    add_column :data_objects, :harmful_effect_id, :integer
  end

  def self.down
    remove_column :data_objects, :toxin_id
    remove_column :data_objects, :harmful_effect_id
  end
end
